[Io] Flow 3a release progress update

[Brenda]

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Below is the class hierarchy diagram for Flow 3a.  There is no
particular reason to expect it to change before release.  If you are
having line wrap issues, it will probably look better pasted into a
Workspace.

Testing to confirm none of my refactorings broke anything is under way.
 The next step will be to file out in such a way that it can be filed
into a 3.2 stock image.  The tricky part will be identifying Flow's
dependencies on changes in non-Flow classes.  I plan to make filing in
work for all target stock images (Squeak 3.2, 3.6, 3.7, 3.8 and 3.9)
before releasing any of the changesets, in hopes that the code named
Flow 3a can be & work as similarly as possible in all the target images.

Brenda

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ProtoObject
	Object

		Collection
			SequenceableCollection
				OrderedCollection

					FlowPathSegmentCollection

		TestCase

			FlowTestURI

		InterpreterPlugin

			Flow

		Exception
			Error

				FlowStreamingError
					FlowExhaustion
					FlowExternalResourceError
						FlowConnectionRefused
						FlowEncodingMismatch
						FlowFailedReadingAttempt
						FlowFailedWritingAttempt
						FlowFilesystemError
							FlowFileNotFound
						FlowInvalidPositioningAttempt
						FlowInvalidReadingAttempt
						FlowInvalidWritingAttempt
						FlowTimeout
						FlowUnresolvableHostname
					FlowOverflow
				FlowIllegalURI

		FlowCorrespondent
			FlowClient
				FlowIncomingClient
					FlowIncomingHTTPClient
				FlowOutgoingClient
					FlowOutgoingHTTPClient
					FlowOutgoingPOPClient
			FlowServer
				FlowHTTPServer

		FlowTransport
			FlowSerialTransport
			FlowIP4Transport

		FlowStream
			FlowPositionableStream
				FlowWritableStream
					FlowDiscardingStream
					FlowExternalStream
						FlowFileStream
							FlowAppendingFileStream
							FlowAppendingFileStreamWriter
							FlowRemoteFileStream
						FlowNetStream
							FlowHardwareStream
								FlowAudioStream
								FlowIEEE1394Stream
								FlowParallelPortStream
								FlowSerialPortStream
							FlowIP4Stream
								FlowTCPStream
								FlowUDPStream
					FlowNetMessage
						FlowHTTPMessage
							FlowHTTPRequest
							FlowHTTPResponse
						FlowNewsMessage
		FlowURIStream

		FlowExternalResource
			FlowFile
			FlowNetResource
				FlowHardwarePort
					FlowAudioPort
					FlowIEEE1394Port
					FlowInfraredPort
					FlowParallelPort
					FlowSerialPort
					FlowUSBPort
				FlowIP4Socket
					FlowTCPSocket
						FlowClientTCPSocket
							FlowIncomingClientTCPSocket
							FlowOutgoingClientTCPSocket
						FlowServerTCPSocket
					FlowUDPSocket
			FlowIP4AddressResolver
			FlowSpeechRelay

		FlowHostPlatform
			FlowMacintosh
			FlowRiscOS
			FlowUnix
			FlowWin32

		FlowURI
			FlowHierarchicalURI
			FlowOpaqueURI

		FlowAuthority
			FlowRegisteredAuthority
			FlowPeerAccessAuthority

		FlowIP4Address
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